Web test tool that allows you to create, run, and debug test cases for Web applications. Freeware

Yawet 0.5 is a Java application for version 1.4 or higher. It features a Swing GUI, verification of HTML, PDF, and XML documents, parametrisation, libraries, HTML frame support, console mode, project files in XML format, integrated HTML tree parsing, and log and report generation. It is extendable with Java.

XML/Java Framework for rapidly and easily developing J2EE business applications. LGPL

OpenXava 2.1.5 is based on business components defined with XML. It is feature rich and flexible, since it has been used for years to create real business applications.

Object/relational persistence and query library. LGPL

BeanKeeper 2.3.0.3 (formerly Simple Persistence for Java) is a full featured, powerful object/relational persistence and query library. It has a unique philosophy of simpleness and ease of use: it does not require config files, annotations, code generation, code "enhancing", or any kind of tools to be used. It handles simple Java beans (or POJOs) and its query service returns lists. Despite its simpleness, under the hood the library takes care of all the necessary logic: transaction visibility, result list paging, keys and ids, table creation/modification, class relations, inheritance/polymorphism, case sensitiveness, and much more. It currently supports: Oracle, HSQLDB, MySQL, and PostgreSQL.